Paper manufacture



Aug-

W. L. TAYLOR PAPER MANUFACTURE Filed Aug. '7, 1922 m/yf/vrmw WM 0/? 64 w A rom/v.1: r5.

Patented Aug. 5, 1924.

UIITED sra'rss ,aai

WILLIAM L. TAYLOR, or cmcmna'rr, omo.

rarer. MANUFACTURE.

Application filed August 7, 1922. Serial No. 580,057.'

1o forming part of this specification.

. My lnvention relates to the manufacture of asphalt or bitumen pasted paper material, and to the processes involved in pasting the paper by means of the asphalt in such a 5 way as to provide as perfect as possible a sheetfor use in the production of bags and packages with the use of automatic machinery.

In a former application, Serial No. 551.-

Y 018, filed by me on April 10, 1922, I describe a method of paper manufacture, in whichgum streams are used along certain defined paths, patterns, or edges of asphalt,

pasted stock, so as to provide a non-asphaltic 1'5 binder. between the webs of paper along the lines through which the paper is to be out in forming the bag, as well as .the edges of the paper.

In:that application I refer to cement as being used and in this application I desire to cover the use of materials other than what is generally known as cement, which materials have a lubricating quality on the cutting knives used in bag and package making machinery.

In some cases the use of cement or materials having a cementitious quality, but of non-asphaltio nature, will be necessary, and in some cases it will not be advisable to use this material.

I have found that for the best possible operation in high speed automatic machinery it is inadvisable to have a sheet which is more bulky at one point than another. This prevents a full grasp by the pressure rollers of clamp plates in the cutting machinery, and in doing so acts to permit the knives to tear the paper in cutting.

I have found that awater dissolved ee- 50. ment, which is about all that would be used in my first invention in this connection, as

above identified, due to expense of other.

solvents, tends to bulk up the paper where it is cemented alon the margins of the 65 cemented band by t e water getting into i the paper and flowing through it outside of the cemented band, so that it bulks up over the asphalt binder. Also I have found that the cemented band tends to have a reduced bulk over the asphalt portion of the paper and to give way under the pressure rolls, clamps, etc., of the cutting machines.

I have discovered also that usual cements do not have the lubricating quality that is desired under the cutting knives.

Thus in this invention I desire to cover the method of paper manufacture wherein there are lines, zones or patterns of material of bulk to maintain an even thickness sheet so far as possible, whether or not said materials have a cementing quality, so long as they are not of the quality of asphalt having tackiness suficient to act as a binder between two plies of paper. In this one respect I desire to generically cover the in vention set forth in my application above identified in this application rather than to pursue generic claims in the former one.

I accomplish the objects set forth and so avoid the difiiculties mentioned, by that certain process of paper manufacture to be hereinafter more specifically pointed out and claimed.

In the drawings,

Figure 1 represents a piece of pasted paper material formed with lines or bands of non-tacky asphalt or other substance.

Figure 2 is across section of Fi ure 1.

In the drawing I show two plies 0 paper 00 1 and 2, between which is a binding or o'ementing layer of tacky asphalt material 3 for purposes of moisture proofing.

Along the margins of the sheet are bands 4 of other material than the binding asphalt,

and along desired lines running through the sheet are lines 5 of the same other material.

I prefer to use for the bands or streams, a material liquefiable by heat without solvent, and I apply the material in the manner set forth in my application above referred to. I also prefer to avoid materials which will tend to destroy the fiber mat of the paper, such as water-dissolved mate:

rials. I also prefer to use a material which has some solvent action on asphalt, so as to merge the continuous edges of tacky asphalt and the interposed or mar inal bands, thereby (preventing the asphalt from forming a bee along the margins thereof, in

and getting an even thickness of the paper throughout, after it is formed into the doupreliminary work or commercial applications, but having above outlined the various points to be included within the function of the material used in the streams, bands, patterns or zones, it may well be that other products will serve the same purpose.

' The resulting paper product is formed with two plies of paper, preferably, al-

. though the addition of further plies would not modify the fact that two plies, at least,

are employed. The paper is cemented to-' gether by an asphalt which has resiliency and tackiness, so as to bind the plies fairly well together and form a layer of nonporous, moisture-resisting material throughout the body ofthe sheet.

The" lines, etc., ofother material-may or may not act in a cementing capacity on the paper, but they do prevent the cutting knives of paper machinery having to pass through layers of asphalt body in slitting the paper for use in making desired articles therefrom.

The interlined material is of a quality by preference to result in formin a like bulk or caliper to the paper at 51c nontacky lines, as has the main body of the paper. The edges of the sheet, as it is slit or formed at the paper mill, do not have the tacky asphalt extending therefrom.

1. A web, comprising plies of paper, foil or fabric united into a web by a binding, interposed layer of tacky bituminous material, such as asphalt, with selected portions of the web, particularly the lines, where same is to 'be cut substantially free of the bituminous material, and having at such selected portions an interposed layer of other than tacky bitumen, said latter layer being of a solvent nature with the bitumen.

2. A web, comprising plies of paper, foil or'fabric united into a web by a binding, interposed layer of tacky bituminous material, such as asphalt, with'selected portions of the web, particularly the lines, where same'is to be cut substantially free of the bituminous material, and having atsuch se lected portions an-interposed layer of other than tacky bitumen, said layer being of-a waxy lubricating quality on cutting knives.

3. A process. of forming narrow webs of asphalt pasted stock, which consists in first forming a wide web by unitin plies of paper, foil or fabric with an asp alt or related bitumen with said materials, substantially omitted alon selected bands, lengthwise of the web, and with a material having a waxy lubricating uality on cutterknives interposed between t e plies throughout said selected bands, and then cutting the wide Web into narrow webs along the said bands.

WILLIAM L. TAYLOR. 

